<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="uploadChange"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="downloadTemplate">下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="uploadExcel">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>
    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>
    </el-row>
  </el-dialog>
</template>
<script>

import { getImportTemplate, uploadExcel } from '@/api/employee'
import FileSaver from 'file-saver'
import upload from 'element-ui/packages/upload'
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    upload() {
      return upload
    }
  },
  methods: {
    async uploadChange(e) {
    //   获取到用户上传的文件
      const files = e.target.files // 文件列表
      if (files.length) {
        try {
          const file = files[0] // 获取到用户具体的文件对象
          const fd = new FormData()
          // 获取到的文件添加到formData
          fd.append('file', file)
          // 提交 >> 调用上传接口
          await uploadExcel(fd)
          // 关闭弹层
          this.$emit('update:showExcelDialog', false) // 父子传值的时候用到了.sync修饰符
          // 更新数据
          this.$emit('uploadSuccess')
        } catch (e) {
          console.log(e)
        } finally {
        //   不管成功或者失败都会走finally
        //   用户选择的文件清空
          this.$refs['excel-upload-input'].value = ''
        }
      }
    //   文件放到formData对象里面
    //   把这个formData上传
    },
    uploadExcel() {
    //   点击了上传按钮的时候 >> 模拟点击input type=file的这个dom
      this.$refs['excel-upload-input'].click()
    },
    async downloadTemplate() {
      const data = await getImportTemplate()
      console.log(data)
      // 第一个参数要下载的文件流，第二个参数文件名称
      FileSaver.saveAs(data, '员工导入模板')
    }
  }
}
</script>

<style scoped lang="scss">
.upload-excel {
  display: flex;
  justify-content: center;
  margin: 20px;
  width: 360px;
  height: 180px;
  align-items: center;
  color: #697086;
  .excel-upload-input {
    display: none;
    z-index: -9999;
  }
  .btn-upload,
  .drop {
    border: 1px dashed #dcdfe6;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 160px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .drop {
    line-height: 40px;
    color: #bbb;
    i {
      font-size: 60px;
      display: block;
      color: #c0c4cc;
    }
  }
}
</style>
